Colour de Verre Square Napkin Ring Mold Create beautiful, customized Napkin Rings - two at a time - with our Square Napkin Ring design. Just prime the mold, fill it with any color and mesh frit you wish, and fire it. Don’t miss the Round Napkin Ring design. The Square Napkin Ring design is about 4.75 x 9 x 1 inches (12 x 23 x 2.5 cm). The fill weight for each ring is 85 grams. The finished pieces are 3 inches (78 mm) across.